EP2136600A2 - Appareil de gestion de session, système de communication, et procédé de sortie de session - Google Patents

Appareil de gestion de session, système de communication, et procédé de sortie de session Download PDF

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Publication number
EP2136600A2
EP2136600A2 EP09161197A EP09161197A EP2136600A2 EP 2136600 A2 EP2136600 A2 EP 2136600A2 EP 09161197 A EP09161197 A EP 09161197A EP 09161197 A EP09161197 A EP 09161197A EP 2136600 A2 EP2136600 A2 EP 2136600A2
Authority
EP
European Patent Office
Prior art keywords
session
communication
time period
information
mobile terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09161197A
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German (de)
English (en)
Other versions
EP2136600A3 (fr
Inventor
Toshiyuki Kambe
Akira Yanagisawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP2136600A2 publication Critical patent/EP2136600A2/fr
Publication of EP2136600A3 publication Critical patent/EP2136600A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/143—Termination or inactivation of sessions, e.g. event-controlled end of session
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities

Definitions

  • the present invention relates to a wireless communication system including fixed and mobile wireless terminals that connect to base station apparatuses.
  • wireless terminals In a WiMAX (Worldwide lnteroperability for Microwave Access) system that enables communications in various places by covering communication areas by multiple base station apparatuses, wireless terminals establish a session through a base station apparatus to perform communication. By establishing sessions, communications having a guaranteed quality can be continuously performed.
  • WiMAX Worldwide lnteroperability for Microwave Access
  • a wireless terminal in the WIMAX system can move out of the coverage area of a base station apparatus. If a wireless terminal which has established a session moves out of the coverage area of the base station and becomes and remains unreachable for some time, the wireless terminal autonomously disconnects the call but information about the session remains in the WiMAX system. It is disadvantageous for session management and band management if information about a session that is no longer used for communication remains in the system. Therefore it is necessary to clear out residual session information.
  • a known typical method for clearing out a residual session is to forcibly disconnect the session in which no communication has been performed for a period longer than or equal to a predetermined time period (see Japanese Patent Laid-Open No. 2002-330489 or No. 2008-28996 ).
  • session information remaining in a system can be cleared from the system,
  • Mobile wireless terminal hereinafter referred to as “mobile terminals” and fixed wireless terminals (hereinafter referred to as “fixed terminals”) coexist in a WiMAX system.
  • Terminals that move out of the coverage of a base station apparatus while maintaining a session are mainly mobile terminals and fixed terminals are less likely to exit from the coverage of a base station terminal.
  • any sessions, during which no communication has been performed for a predetermined time period or longer, are forcibly disconnected regardless of whether the terminals are fixed or are mobile terminals, most residual sessions of mobile terminals can be cleared out but sessions of fixed terminals during which no communication has been performed under normal conditions in most cases will be disconnected. Consequently, for a fixed terminal that is in the on state in the nighttime, for example, disconnection from and reentry into a session are repeated, which can squeeze the system bandwidth and place an extra load on an authentication server.
  • An exemplary object of the present invention is to provide a technology for properly maintaining a normal session and for clearing out a residual session in a wireless communication system in which mobile terminals and fixed terminals coexist.
  • a session management apparatus includes:
  • a communication system includes:
  • a session clear-out method includes:
  • FIG. 1 is a block diagram showing a wireless communication system according to an exemplary embodiment.
  • the wireless communication system includes session management apparatus 11, fixed terminals 14, and mobile terminals 15.
  • Session management apparatus 11 is connected to core network 13. Fixed terminals 14 and mobile terminals 15 are connected to radio access network 12. Radio access network 12 and core network 13 are interconnected.
  • Fixed terminals 14 are wireless terminals stationarily installed in places such as buildings.
  • Mobile terminals 15 are carried by users and are used while the user is moving.
  • Fixed terminals 14 and wireless terminals 15 connect to radio access network 12 through wireless links, establish sessions on core network 13 through radio access network 12, and perform data communication through the sessions.
  • Mobile terminals 15 perform communication while the sessions are established in such a manner that the time period during which communication is not performed does not exceed a predetermined time (the maximum communication interval. For example, mobile terminal 15 may periodically send a "Keep Alive” message at the maximum communication intervals or shorter intervals. Alternatively, mobile terminal 15 may send a "Keep Alive” message after mobile terminal 15 has sent no data for the maximum communication interval.
  • the "Keep Alive” message may be any signal that updates session information and may contain any information. Fixed terminals 14 do not have to send the "Keep Alive” message or may send the "Keep Alive” message like mobile terminal 15.
  • Core network 13 provides a communication link for data communication performed by wireless terminal, including fixed terminals 14 and mobile terminals 15, and transfers data using the Internet protocol.
  • Radio access network 12 includes base station apparatuses 16 and gateway apparatus 17.
  • Base station apparatuses 16 connect to fixed terminal 14 or mobile terminal 15 through a wireless link and relays data communication between the terminal and core network 13.
  • Gateway apparatus 17 is a control gate that connects base station apparatuses 16 to core network 13.
  • Session management apparatus 11 manages a session that connects fixed terminal 14 or mobile terminal 15 to core network 13.
  • Session management apparatus 11 holds session information about sessions both for fixed terminals 14 and for mobile terminals 15 and disconnects, on the basis of the session information, a session the type information of which indicates mobile terminal 15 and in which no communication has been performed for a predetermined monitoring time period or longer.
  • the session information includes type information indicating the type of a terminal and status information indicating the status of communication.
  • the status information may be time information indicating the time at which the last communication was performed, for example.
  • the time information is updated each time communication is performed. In that case, session management apparatus 11 may determine on the basis of the time indicated by the time information and the current time whether no communication has been performed for a time period longer than or equal to the predetermined monitoring time.
  • FIG. 2 is a block diagram showing a configuration of session management apparatus 11.
  • session management apparatus 11 includes session manager 21 and session clearer 22.
  • Session manager 21 holds the session information described above.
  • session clearer 22 Based on the session information held in the session manager 21, session clearer 22 extracts a session the type of which is mobile and in which no communication has been performed for the predetermined monitoring time period or longer and disconnects the session.
  • FIG. 3 shows an example of the session information held in session manager 21.
  • a session ID identifier
  • the terminal type indicating which of fixed terminal 14 or mobile terminal 15 has established the session
  • the last access time indicating the time at which the last communication was performed are recorded as the session information.
  • Session clearer 22 can refer to the terminal type to extract a session of mobile terminal 15 and can refer to the last access time to know how long the session has been in an out-of-communication state.
  • FIG. 4 is a flowchart showing exemplary operation of session clearer 22.
  • session clearer 22 monitors for expiration of a predetermined determination period (step 101) and performs the following operation at determination periods.
  • session clearer 22 selects one session entry from the session information and refers to terminal type to determine whether or not the session is a mobile terminal 15 session (step 102). If the selected session is mobile terminal 15 session, the session clearer 22 refers to the last access time of the session and determines from the last access time indicated and the current time whether no communication has been performed for a time period longer than or equal to the predetermined monitoring time period (step 103).
  • session clearer 22 disconnects the session (step 104). Session clearer 22 may delete session information about that session that is held by session manager 21 to forcibly disconnect the session. Alternatively, session clearer 22 may perform a predetermined session disconnection procedure to cause normal disconnection of the session.
  • session clearer 22 determines whether the process from step 102 to step 104 has been performed for all sessions for which session information is held in session manager 21 (step 105). If the process has been completed for all sessions, session clearer 22 returns to step 101.
  • session clearer 22 selects the next session (step 106) and returns to step 102.
  • FIG. 5 is a sequence chart showing exemplary operation of the communication system according to the exemplary embodiment.
  • session information concerning the session is registered in session management apparatus 11 (step 202).
  • Session management apparatus 11 monitors the session of mobile terminal 15 among sessions for which session information is registered to determine whether the time for which no communication has been performed is longer than or equal to the predetermined monitoring time period.
  • mobile terminal 15 While the session is established, mobile terminal 15 periodically sends a "Keep Alive” message so that the time period during which communication is not being performed exceeds the maximum communication interval (steps 203 and 206).
  • the "Keep Alive” message is provided to session management apparatus 11 through base station apparatus 16 (steps 204 and 207). Session management apparatus 11 updates the last access time in the session information each time the "Keep Alive” message is sent (steps 205 and 208).
  • the session during which the "Keep Alive" message is successfully being transmitted is not detected as a session in which no communication has been performed for the predetermined time period or longer.
  • step 209 mobile terminal 15 moves out of the coverage area. Accordingly, the "Keep Alive" message sent from mobile terminal 15 is not transferred (step 210) or mobile terminal 15 detects that mobile terminal 15 has moved out of the coverage area and forcibly disconnects the session to stop sending the "Keep Alive” message. Consequently, session management apparatus 11 detects that communication has not been performed for predetermined monitoring time period or lounger (step 211) and disconnects the session (step 212).
  • a fixed-terminal monitoring time that is longer than mobile-terminal monitoring time may be introduced for fixed terminals 14 and, after no communication has been performed for the monitoring time or longer in a session of fixed terminal 14, the session may be disconnected.
  • the mobile-terminal monitoring time may be set in minutes or hours and the fixed-terminal monitoring time may be set in days, so that the frequency of session disconnections and reentries for fixed terminals 14 can be kept low while sessions of fixed terminals 14 that actually failed or were otherwise discontinued but still remain can be removed.
  • the present invention may be configured by taking into consideration differences in character among cells.
  • the densities of and ratio between mobile terminals 14 and fixed terminals 15 differ from region to region. Consequently, the number of residual sessions and the degree of influence of residual sessions on the system may differ among regions. Therefore, the monitoring time period (which may include a fixed-terminal monitoring time period and a mobile-terminal monitoring time) for determining whether a session should be disconnected or not may be allowed to be set for each individual cell.
  • a shorter monitoring time may be set for a region where many residual sessions occur or a region where the ratio of the band occupied by residual sessions is high, in order to facilitate removal of residual sessions.
  • a shorter mobile-terminal monitoring time and a longer fixed-terminal monitoring time may be set for a region where the ratio of the mobile terminals 14 is high in order to especially facilitate removal of residual sessions of mobile terminals 14.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Computer And Data Communications (AREA)
  • Communication Control (AREA)
EP09161197.0A 2008-06-18 2009-05-27 Appareil de gestion de session, système de communication, et procédé de sortie de session Withdrawn EP2136600A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008159138A JP5176713B2 (ja) 2008-06-18 2008-06-18 セッション管理装置、通信システム、およびセッション整理方法

Publications (2)

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EP2136600A2 true EP2136600A2 (fr) 2009-12-23
EP2136600A3 EP2136600A3 (fr) 2014-04-09

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EP09161197.0A Withdrawn EP2136600A3 (fr) 2008-06-18 2009-05-27 Appareil de gestion de session, système de communication, et procédé de sortie de session

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EP (1) EP2136600A3 (fr)
JP (1) JP5176713B2 (fr)
CN (1) CN101610530B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
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WO2011085290A1 (fr) * 2010-01-08 2011-07-14 Interdigital Patent Holdings, Inc. Procédé et appareil de déchargement d'un trafic sur protocole internet sélectionné
US11838859B2 (en) 2019-03-29 2023-12-05 Honda Motor Co., Ltd. Information processing apparatus, information processing method, and program

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JP6055389B2 (ja) * 2013-10-08 2016-12-27 株式会社Ｎｔｔドコモ 無線基地局
CN109462876B (zh) * 2018-11-09 2021-03-30 广东工业大学 4g与5g系统数据互操作方法、装置、设备及存储介质

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JP2006195690A (ja) 2005-01-13 2006-07-27 Sharp Corp 通信端末装置およびデータ通信システム
JP2008028996A (ja) 2006-06-21 2008-02-07 Nec Corp 通信システム、通信方法、およびプログラム

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JP2006195690A (ja) 2005-01-13 2006-07-27 Sharp Corp 通信端末装置およびデータ通信システム
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Cited By (5)

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WO2011085290A1 (fr) * 2010-01-08 2011-07-14 Interdigital Patent Holdings, Inc. Procédé et appareil de déchargement d'un trafic sur protocole internet sélectionné
CN102714788A (zh) * 2010-01-08 2012-10-03 交互数字专利控股公司 用于广播对选择的网际协议业务卸载的支持的方法和装置
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US11838859B2 (en) 2019-03-29 2023-12-05 Honda Motor Co., Ltd. Information processing apparatus, information processing method, and program

Also Published As

Publication number Publication date
EP2136600A3 (fr) 2014-04-09
JP5176713B2 (ja) 2013-04-03
JP2010004122A (ja) 2010-01-07
CN101610530B (zh) 2014-10-22
CN101610530A (zh) 2009-12-23

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